Ft. Calhoun is the designated spent fuel storage facility for the entire state of Nebraska...and maybe for more than one state.
Calhoun stores its spent fuel in ground-level pools which are underwater anyway - but they are open at the top. When the Missouri river pours in there, it's going to make Fukushima look like an x-ray. But that's not all. There are a LOT of nuclear plants on both the Missouri and Mississippi and they can all go to hell fast.